The wheels of a car are of diameter 80 cm each.How many complete revolution does each wheels make in 10 minutes when the car is travelling at a speed of 66 km/hour
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time = 10 mins = 1/6 hrs
speed = 66 km/hr
now, distance = speed * time
=> distance = 66 * 1/6
=> distance = 11 km or 1100000 cm
diameter = 80 cm , radius = d/2 = 40 cm
circumference or perimeter of wheel = 2 * 22/7 *40
no of revolution = distance / perimeter or cicumference
=> 1100000 / 2 * 22/7 * 40
=> 1100000 * 7 /2 * 22 * 40
=> 4375 revolutions
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